package com.atguigu.gulimall.product.service.impl;

import com.atguigu.gulimall.product.service.CategoryBrandRelationService;
import org.bouncycastle.util.Arrays;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Autowired
    private CategoryBrandRelationService categoryBrandRelationService;
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> treeList() {
        List<CategoryEntity> allList = this.list();
        List<CategoryEntity> treeList = allList.stream().filter(menu -> menu.getParentCid() == 0).map(item -> {
            item.setChildren(getChildren(item, allList));
            return item;
        }).sorted((item1,item2)->{
            return (item1.getSort()==null?0:item1.getSort())-(item2.getSort()==null?0:item2.getSort());
        }).collect(Collectors.toList());
        return treeList;
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        ArrayList<Long> paths = new ArrayList<>();
        findCatelogPath(catelogId, paths);
        Collections.reverse(paths);
        return paths.toArray(new Long[paths.size()]);
    }

    @Transactional
    @Override
    public void updateCategory(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(), category.getName());

    }

    private void findCatelogPath(Long catelogId, ArrayList<Long> paths) {
        paths.add(catelogId);
        if (this.getById(catelogId).getParentCid() != 0) {
            findCatelogPath(this.getById(catelogId).getParentCid(), paths);
        }
    }

    private List<CategoryEntity> getChildren(CategoryEntity item, List<CategoryEntity> allList) {
        List<CategoryEntity> childList = allList.stream().filter(menu ->
                menu.getParentCid().equals(item.getCatId())
        ).map(menuEntity->{
            menuEntity.setChildren(getChildren(menuEntity,allList));
            return menuEntity;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return childList;
    }
}
